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object Test {
def testPermutations1(num: Int, stream: Stream[Int]): Unit = {
val perm = stream.permutations
print(num)
while(perm.hasNext) {
print(" " + perm.next().toList)
}
println()
}
def testPermutations2(num: Int, stream: List[Int]): Unit = {
val perm = stream.permutations
print(num)
while(perm.hasNext) {
print(" " + perm.next().toList)
}
println()
}
def main(args: Array[String]): Unit = {
testPermutations1(1, Stream(1))
testPermutations2(1, List(1))
testPermutations1(2, Stream(1, 2))
testPermutations2(2, List(1, 2))
testPermutations1(2, Stream(2, 1))
testPermutations2(2, List(2, 1))
testPermutations1(3, Stream(1, 2, 3))
testPermutations2(3, List(1, 2, 3))
testPermutations1(3, Stream(1, 3, 2))
testPermutations2(3, List(1, 3, 2))
testPermutations1(3, Stream(2, 1, 3))
testPermutations2(3, List(2, 1, 3))
testPermutations1(3, Stream(2, 3, 1))
testPermutations2(3, List(2, 3, 1))
testPermutations1(3, Stream(3, 1, 2))
testPermutations2(3, List(3, 1, 2))
testPermutations1(3, Stream(3, 2, 1))
testPermutations2(3, List(3, 2, 1))
}
}
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